Specification Part 3 - Road & Bridge Works - Urban Administration ...

(c) Only the materials satisfying the density requirements given in Table 300.2 should be used for
the embankment.
(d) Compaction shall be as per table 300.3.
(e) The quality of materials and work shall be exercise in accordance with clause 903.
305.6.1 Surface Finish :-
The permitted tolerance in surface level for sub-grade will be +20mm and (-) 25 mm.
305.6.2 Surface Regularity :-
The maximum allowable difference between the road surface and underside of a 3m straight edge shall
be 20 mm for the longitudinal profile and 15mm for the cross profile.
305.7 Sub-grade Strength
305.7.1 It shall be ensured prior to actual execution that the borrow area material to be used in the subgrade
satisfies the requirements of design CBR.
305.7.2 Sub-grade shall be compacted and finished to the design strength consistent with other physical
requirements. The actual laboratory CBR values of constructed sub- grade shall be determined on
undisturbed samples cut out from the compacted sub-grade in CBR mould fitted with cutting shoe or on
remoulded samples, compacted to the field density at the field moisture content.
305.8 Measurements for Payment
(a) Each embankment/sub-grade construction shall be measured separately by taking cross
sections at intervals in the original position before the work starts and after its completion as detailed
below.
(b) Levels shall be taken before and after construction, at grid or points 10 m centre to centre
longitudinally in straight reaches but 5 m at curves. Normally, on two-lane roads, the levels shall be
taken at four positions transversely, at 0.75 and 2.75 m from either edge of the carriageway; and on
single lane roads, these shall be taken at two positions transversely, being at 1.25 m from either edge of
the carriageway. For multi-lane roads, levels shall be taken at two positions transversely for each lane
at locations specified by the Engineer. Suitable references for the transverse grid lines should be left in
the form of embedded bricks on either ends or by other means so that it is possible to locate the grid
points for level measurements after each successive course in laid.
(c) The computation of volumes for earthwork in cubic metres by the method of average end areas
shall be done.
(d) The measurement of fill material from borrow areas shall be the difference between the net
quantities of compacted fill and the net quantities of suitable material brought from roadway and
drainage excavation. For this purpose, it shall be assumed that one cu.m of suitable material brought to
site from road and drainage excavation forms one cu.m of compacted fill and all bulking or shrinkage
shall be ignored.
(e) Construction of high embankment with specified material and in specified manner shall be
measured in cu.m.
(f)
Stripping including storing and reapplication of top soil shall be measured in cu.m.
(g) Work involving loosening and recompacting of ground supporting embankment /subgrade shall
be measured in cu.m.
(h) Removal of unsuitable material at embankment/sub-grade foundation and replacement with
suitable material shall be measured in cu.m.
(i) Scarifying existing granular/bituminous road surface shall be measured in square metres.
Dismantling and removal of existing cement concrete pavement shall be measured vide Clause 202.6.